Covert beast team help

With the introduction of Mysterious Sentinel and his epic attack for an A+ I decided to switch out my Rancor Wrym team and build a Beast one. I lose one combo but hope that the extra fire power can make it viable.

So far I have Sentinel+, Bayard+, Centaur+ and am looking to get Simian+ as my fourth. Problem is trying to add a decent 5th.

Due to Sentinels lack of a skill I want to make the most out of the other 4; so Psycho down, Agility, Def Down work well. But having a problem with another good skill Beast. The only other beast I have is Mad Lion but his preemptive is not something that works well imo where i will be maximising agility anyway. Can anybody suggest a heavy hitting, decent skill, Rancor beast?

Replace Centaur with Beast Soul Knight and pick up Fire Wing Roc for the Increase Party Attack.

I would go for a fire wing roc, ipa is an absolute must, and you don't have too many choices with ipa, and i would actually replace centaur with beast soul knight; same skill, higher atk. i've faced many beast teams that for some strange reason don't include ipa and instead try to rely on higher def/health; they have fallen before my demons, barely able to scratch them, and it's not like my demons(except kag) are defense specialists or anything.

edit: horg, you beat me to the punch, lol

Thanks guys seems we have a consensus!

My EP is rock bottom at the moment so will have to wait a week or so to pick those two up. Any ideas on what I should be able to get them for?

BSK was very cheap before. 3-4 EP for A version.
Fire Roc is harder to find. But I have seen it go for around 5-6 EP for A version.
Simian is around 4-5 EP as well.

Got 2 Simians for 3ep and 2ep but now down to just 2ep! Thankfully have some bp and praying that event is bp heavy so I can flip.